Diestock



Oct. 18, 1932. B. T. BORDEN DIESTOCK Filed Aug. 16, 1930 2 Sheets-Sheet1 Oct. 18, 1932. B, T, BORDEN 1,883,333

DIESTOCK Filegl Aug. 16, 1930 2 Sheets-Sheet 2 Patented Oct. 18, 1932 -DA E' PATENT? ormer.- v

BRADFORD T. BORDEN, OF LAKEWOOD, OHIO, ASSIGNOR ONE-HALF TO WILLIAM A.

NERACHER, OF WARREN, OHIO, AND ONE-HALF TO THE BORDEN COMPANY, OF

WARREN, OHIO, A CORPORATION OF OHIO DIESTOOK Application filed August16, 1930. Serial No. 475,781.

This invention relates to a die stock of the type wherein the positionduring the thread cutting operation.

- One of the objects of the invention is to provide such a tool in acompact and simple form adapted to be cheaply produced, and, to thatend, I provide a very simple readily removable clamping device adaptedto hold the chasers in position.

My invention also contemplates means for positively holding the chasersin various positions, whereby different sizes of pipe may be threaded bythe same tool. My tool is adapted for car- -rying chasers with cuttingteeth on both ends,

' my die stock.

, on Fig. 2.

so that by reversing the chasers the number of sizes which may be cut isdoubled. Thus, in one tool, I can thread forinstance a pipe of A, andsizes, or in a larger and 2 sizes.

My die stock is illustrated in the drawings hereof, is hereinafter morefullyexplained, and its essential novel features are summarized in theclaims.

In the drawings Fig.1 is a face view of Fig. 2 is a side elevationthereof. Fig. 3 is a rear view. Fig. 4 is an axial section. Fig. 5 is asection in a plane paral lel with Fig. 1, as indicated by the line 5-'5Fig. 6 is a fragmentary radial section on similar to Fig. 6, but showingthe clamping plate in released position. *Fig. 8 is a face view of theclamping plate. 1

The frame of my die stock comprises a suitable hollow member 10,'whichmay be a single integral casting, carrying the threadcutting chasersadjacent one end and a suitable pipe guide adjacent theother. Inter-,mediately, means are provlded for rotating the frame. I have shown forthis purpose the frame equipped with two diametrically opposite sockets11 into which suitable handles 20 may extend, though any other means maybe provided for rotating the frame.

On one side of its intermediate region, the frame is rovided with anumber of equidistant houslngs for the chasers, each housing comprisinga pair of parallel bosses 12 and 13' leaving a parallel-sided recessbetween them.

chasers remain in fixed 66 on Fig. 1. Fig. 7 is a view Each recess isadapted to be occupied a parallel-sided chaser 30. On opposite.

holding the chasers down against the frame and of defining theirpositions.

lug or pin 31 which is The clamping plate above mentioned is best shownat 40 in Figs., 1 and 8. It hasa central opening 41 of "a greaterdiameter than the largest size of pipe within the range of the diestock, to the frame. The plate is providedfwith openings which receivethe chaserpins 31 to define the ings being so arranged that the. chasermay be held positively in any one of several positions.

In the clamping plate shown, the defining openings are in the form ofpeculiarly placed slots 45. These slots are some distance back from theinnerv periphery. of the platean'd diverge from a region near thatperiphery.

position of the chasers, these openand in use is rigidly clamped;

Each slot has a substantially semi-circular,

end 42 near such inner periphery and a subdistance back.

' 'stantial semi-circular end 44 a'con'siderable' The Walls of the slotcon-' necting these end portions and preferably flatly arcuate, thatinan intermediate region of thefouter an important feature being.

wall is a depression 43 adapted to coact with the chaser pin and locatethe chaser definitely in its intermediate position. Thus, when each slot45 receives the pin 31 of the correspending chaser, if that pin isagainstthe end42 of the slot the chaser is in its inner,-

most position, when the pin is: against the.

. end 44 the chaser is in its outermost position,

and when the pin isoccupying thedepression 43 the chaser is in desiredposition in its intermediate location.

rests against the faces.

The clamping plate of the bosses 12 and 13 and'is concentrically held byarcuate lugs 14 at the outer edges of such bosses which engage thecircular periphery of the clamping plate. The clamping plate is held onthe frame by screws 50 (four being shown), which are threaded in theframe bosses and have their heads 51 overhanging the clamping plate,these bosses being integral with the frame but located externally of themain portion thereof.

To enable the clamping plate to be readily V removedwithout requiringthe entire removal Hing screws are loosened of the screws from theframe, I form arcuate recesses ea in the outer periphery of the platewhich are normally out of registration with the screw heads, but whichwhen the plate is given an angular movement into an abnormal position,may be caused to register with such heads, and are of such size that theplate maythen be withdrawn between the heads. V

When the screws 50 are turned into place the clamping plate isheldrigidly on the frame and also efficiently engages the outer faces ofthe chasers. The chasers which are thus completely housed, arerectangular in cross section, are thus not only definitely located'by'their pins 31 seating in specially positioned openings but may betightly clamped in place by the tigntened clamping plate. 7 7

If the die stock is set, for example, for thesmallest pipe to bethreaded, the chaser pins 31'wi1l occupy the ends 42 of'the slots inthe'plate 10. Now to reset the die stock for-the next larger size ofpipe it is only necessary to loosen the screws 50, andto shift f theplate until the pins 31 engage the slot depressions 4L3 and thenreclainp the plate.

The adjustment described is sufiicient for two adjacent size of pipe,which have the same pitch for threads and may be cut by To enable thesame ent teeth on opposite ends of the chasers 30; then by looseningthescrews and raising the. clamping plate, as illustrated in Fig. 7, I

can takethe chasers out and turn them endfor-end; after restored. v

j The pins 31 are a short distance from the mid-region of the chaserstoward the end havwhich the" clamping plate is ,ing the coarser teeth,so that when the chasers are reversed if the pins occupy the depression431a position is providedsuitable for the smaller one of the two largersizes. To set the die stock'for the largest size the clampare caused toengage the ends 44 of the slots. Accordingly by providing the threepositions ofthe clamping ring and the double ended chasers I am enabledto adapt the die stock for threading four sizes of pipe.

It is necessary to provide variable guiding means for thedifi'erentsizes of pipe. This could be effected bymaking theguiding opening int-heframe of a size corresponding to thelargest size of pipe, and providingthree er guides carried thereby, and the chaser pinsl chaser guide andhaving located recess at that side bushings of different thicknesses forthe other three sizes, or I may employ the permanentlymounted settableguide which is illustrated herein, but which forms the basis of acopending application of mine. Briefly this guide operates as follows:

As shown, the frame 10 has on the side opposite the'chaser housings, aflat rectangular extension 18 bounded by a pair of ribs 19. Betweenthese ribs, I provide a pair of square blocks -having on their foursides different arcuate recesses 61 forming portions of two cylinderscorresponding to the exterior of the four sizes of pipe with which thedie stock may be used. Each block is pivotally secured to the frame by ascrew 62 which passes through the center of theblock and is threaded inthe frame. cupies a cylindrical cavity in the block and compresses ahelical spring 65 against the base 'of the cavity- However, by simplygrasping the block by ones thumb and finger in two of the opposedrecesses 61, one may pull the block outwardly until it can clear he ribs19 and then give it a quarter turn, or a multiple thereof, to present adiflerent re cess' to the die stock axis.

It will be seen that my very few parts,'and these may be ofcomparatively light construction, so that I provide a tool which has theadvantages of lightness, compactness, and cheapness of manufacture, andat the same time is adapted for many diferent sizes of pipe. Thenotching of the outer periphery of the clamping plate enables its entireremoval very readily, which entirely frees the chasers for removal forcleaning or repair, as well as for reversal.

claim:

1. In a die stock, the combination of a hollow frame, chaser guidescarried thereby, chasers occupying said guides and having shoulders, andan annular clamping plate having slots, one for each chaser, positionedobliquely to the chaser guides and each adapted to coact with the chasershoulder in various positions of the plate, each slot having anintermediately located recess at that side of the slot which is fartherfrom the plate axis to define an intermediate position of the chaser andhinder the outward thrust on the chaser from rotating the plate.

2. The combination of a hollow frame, chaschasers occupying said guidesandhaving outwardly pro ecting pins, and anannular clamping plate havingslots through it, one for each chaser and adapted to receive the pin ofthe corresponding chaser, each slot being oblique to the anintermediately 1s farther from the plate 'axis[ 3. The combination of ahollow frame, chaser guides carried thereby, chasers occupying saidguides, and each having an out-.

The head of this screw ocdie stock comprises ofthe slot which wardlyprojecting pin, a clamping ringhaving slots through it adapted toreceive the pin of the corresponding chaser, each slot be- In testimonywhereof, I hereunto afiix my signature.

BRADFORD T. BORDEN.

